1 files changed, 118 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/nobase/ExtendToEStructuralFeatureSource.java b/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/nobase/ExtendToEStructuralFeatureSource.java
new file mode 100644
index 00000000..fc79640b
--- /dev/null
+++ b/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/nobase/ExtendToEStructuralFeatureSource.java
@@ -0,0 +1,118 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2015, Marton Bur, Zoltan Ujhelyi, Akos Horvath, Istvan Rath and Daniel Varro
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.localsearch.operations.extend.nobase;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.function.Function;
+
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.EReference;
+import org.eclipse.emf.ecore.EStructuralFeature;
+import tools.refinery.viatra.runtime.base.api.NavigationHelper;
+import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
+import tools.refinery.viatra.runtime.localsearch.exceptions.LocalSearchException;
+import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
+import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
+import tools.refinery.viatra.runtime.localsearch.operations.extend.SingleValueExtendOperationExecutor;
+
+/**
+ * Iterates over all sources of {@link EStructuralFeature} using an {@link NavigationHelper VIATRA Base indexer}.
+ * It is assumed that the indexer is initialized for the selected {@link EStructuralFeature}.
+ * 
+ */
+public class ExtendToEStructuralFeatureSource implements ISearchOperation {
+    
+    private class Executor extends SingleValueExtendOperationExecutor<Object> {
+        
+        private Executor() {
+            super(sourcePosition);
+        }
+        
+        @SuppressWarnings("unchecked")
+        @Override
+        public Iterator<?> getIterator(MatchingFrame frame, ISearchContext context) {
+            if(!(feature instanceof EReference)){
+                throw new LocalSearchException("Without base index, inverse navigation only possible along "
+                        + "EReferences with defined EOpposite.");
+            }
+            EReference oppositeFeature = ((EReference)feature).getEOpposite();
+            if(oppositeFeature == null){
+                throw new LocalSearchException("Feature has no EOpposite, so cannot do inverse navigation " + feature.toString());            
+            }
+            try {
+                final EObject value = (EObject) frame.getValue(targetPosition);
+                if(! oppositeFeature.getEContainingClass().isSuperTypeOf(value.eClass()) ){
+                    // TODO planner should ensure the proper supertype relation
+                    return Collections.emptyIterator();
+                }
+                final Object featureValue = value.eGet(oppositeFeature);
+                if (oppositeFeature.isMany()) {
+                    if (featureValue != null) {
+                        final Collection<Object> objectCollection = (Collection<Object>) featureValue;
+                        return objectCollection.iterator();
+                    } else {
+                        return Collections.emptyIterator();
+                    }
+                } else {
+                    if (featureValue != null) {
+                        return Collections.singleton(featureValue).iterator();
+                    } else {
+                        return Collections.emptyIterator();
+                    }
+                }
+            } catch (ClassCastException e) {
+                throw new LocalSearchException("Invalid feature target in parameter" + Integer.toString(targetPosition), e);
+            }
+        }
+        
+        @Override
+        public ISearchOperation getOperation() {
+            return ExtendToEStructuralFeatureSource.this;
+        }
+    }
+
+    private int targetPosition;
+    private EStructuralFeature feature;
+    private int sourcePosition;
+
+    public ExtendToEStructuralFeatureSource(int sourcePosition, int targetPosition, EStructuralFeature feature) {
+        this.sourcePosition = sourcePosition;
+        this.targetPosition = targetPosition;
+        this.feature = feature;
+    }
+
+    public EStructuralFeature getFeature() {
+        return feature;
+    }
+    
+    @Override
+    public ISearchOperationExecutor createExecutor() {
+        return new Executor();
+    }
+    
+    @Override
+    public String toString() {
+        return toString(Object::toString);
+    }
+    
+    @Override
+    public String toString(Function<Integer, String> variableMapping) {
+        return "extend    "+feature.getContainerClass().getSimpleName()+"."+feature.getName()+"(-"+variableMapping.apply(sourcePosition)+", +"+variableMapping.apply(targetPosition)+") iterating";
+    }
+
+    @Override
+    public List<Integer> getVariablePositions() {
+        return Arrays.asList(sourcePosition, targetPosition);
+    }
+    
+}